About 20 minutes before sunset. The clouds appeared to be directly over the US/ Canada border. Photo direction is almost due north. We were sitting on our deck when a Bald Eagle flew by perhaps 50 feet across our view carrying a recently snatched seabird. As we processed what we had just seen. I looked up and saw this. Have spent many hours marveling at clouds but has never seen these before. Taken with my Samsung S10 phone.